A Dumont man will receive up to 45 years in prison after pleading guilty on Monday to fatally shooting his ex-girlfriend with an assault rifle.

Jordan Turner, 25, admitted in Superior Court in Hackensack that he shot 22-year-old Heather Reyes of Bergenfield twice at his Quackenbush Avenue home on Feb. 26, 2011.

Turner also admitted that he purchased the Del-Ton DTI-15 semiautomatic rifle a few weeks before the killing.

Bergen County prosecutors said at the time that Turner called Bergenfield police a few hours after the shooting and told them that he had killed Reyes. He later turned himself in at the AMC movie theater in Paramus, they said.

Turner was unable to give an exact address but gave them the name of the street and a description of the house where he rented a room, prosecutors said.

Authorities said they found Reyes in a pool of blood in the room that Turner had been living in for about a month. They said they also found the assault rifle.

Reyes’ relative said that Reyes and Turner met while they were going to Bergenfield High School and later dated for about four months.

Turner said at the hearing on Monday in Superior Court in Hackensack that he caught Reyes cheating on him – but Reyes’ relatives and Bergen County prosecutors have said the two had broken up before the killing.

Answering questions from his attorney, Francis Meehan, Turner said he invited Reyes over to his home so she could get some clothes that she had left there.

He said he got angry after the two began arguing, and that he retrieved the gun from his car and shot Reyes.

Danielle Grootenboer, an assistant Bergen County prosecutor, said she will recommend a 45-year prison term for Turner when he is sentenced Sept. 5. He will remain until then at the Bergen County Jail, where he has been held since his arrest on $1 million bail.

The murder conviction is the latest and most serious addition to Turner’s criminal history. He was sentenced to 191 days in jail and two years of probation after he pleaded guilty in 2008 to a burglary charge, according to court records.

He was also sentenced to 235 days in jail and three years of probation after he pleaded guilty in 2009 to conspiracy in connection to another burglary, records show.